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~I know that `The request for this plugin could not be satisfied because the plugin is already on the classpath with an unknown version` is usually solved by adding `apply false`  in the root project, but does anyone know how to fix it when using `org.gradle.testkit.runner.GradleRunner`. If I have a convention plugin for the root project,  convention plugins for sub projects  and use `.withPluginClasspath()` I'm unable to solve the error~

nevermind, my test project was applying convention plugins from a version catalog which defined an explicit library. If I change all usages of `alias(libs.plugins.convention)` with `id(libs.plugins.convention.get().pluginId)` it works

But the former does apparently work when there's no plugins applied in the root project.